Layers of the Grand Canyon

Samuel Engbring haughty Canyon Paper March 7,2012 Rock Layers of the dire Canyon The Grand Canyon is an amazing place to get word numerous variant layers of rock dating all the acantha from the Precambrian to the more than than recent (geologically speaking) Mesozoic era. This canon was starting to form astir(predicate) quintuple to six million years ago by wearing from the Colorado River and other water sources. On our celestial athletic field trip much of this was seen by our ii stops at Cameron and desert view. That gave great overviews of the canons layers. The oldest of the strata is the Unkar congregation which dates all the way endure to 1,100-1,250 million years ago. The layers within this stratum contain ill-sorted sandstones, shales, and basaltic lava flows. The primary fossils that argon found in these incompatible layers argon a variety of algaes and strolomatites. Stromatotites ar the oldest fossils to be found in the Grand Canyon and besides occur in Chaur stratum that is located above the Unkar. The Chaur pigeonholing ranges from 825-1,000 million years ago. The different layers in this stratum are comprised of limestone, sandstone, and some mudstone. Less is known about these two groups because of the slew age of them and because of the great unconformity that made periods of quantify disappear from these two Groups.

The next group to be represented in the canyon wall is the Tonto group. This group was laid down over a period of thirty million years, which is from early to middle Cambrian clock. The most common fossils in these layers are trilob ites and brachiopods. At the time of these l! ayers forming we can conclude that the shoreline was transgressing onto land because finer grade materials were deposited on to creaser grained. The oldest layer of the Tonto group is the Tapeats sandstone, which is roughly five speed of dismount forty-five million years old. This layer is comprised medium and scarper grained sandstone with ripple marks in it. These ripple marks avouch that a shallow tidal environment with low personnel formed it....If you want to get a full essay, monastic order it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper